Changes in sand fractions of Binggou section and the expansion and contraction of the Tengger desert during 50–30 ka
Changes in sand fractions of Binggou section and the expansion and contraction of the Tengger desert during 50–30 ka
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DOI：
10.1002/esp.1439
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发表时间：
2007-03
影响因子：
3.3
通讯作者：
Xu Shu-Jian;Pan Bao-tian;Gao Hong-shan;C. Guang-jie;Su Huai
中科院分区：
文献类型：
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作者：
Xu Shu-Jian;Pan Bao-tian;Gao Hong-shan;C. Guang-jie;Su Huai
演化过程的迹象在沙漠边缘的风成沉积物中保存完好，使沙漠扩张和收缩的重建成为可能。黄土-沙漠过渡带黄土的含砂量（百分比>63 µm）被用作确定沙漠边缘接近程度的替代指标。根据西北黄土高原主导风向为西北-东南向的特点，设计了一条样带，观测了末次冰期风成沉积物的沉积学特征的空间变化。样带由12个黄土剖面组成，起点位于黄土高原与腾格里沙漠的过渡地带沙坡头，终点位于黄土高原最南端的西秦岭北麓天水。揭示了马兰黄土的时空分布特征，即由西北向东南含砂量逐渐减少。得出了与黄土高原东部相似的含沙率与距离的线性相关模型。在此基础上，以冰沟剖面的光释光测年为依据，建立了腾格里沙漠扩张和收缩的详细定量模型。版权所有© 2006约翰威利父子有限公司。
Signs of the evolutionary process are well preserved in the aeolian deposits of desert margins and enable reconstruction of desert expansion and contraction. The sand content (percentage >63 µm) of loess in the loess–desert transitional zone was used as a proxy indicator for determining the proximity of the desert margin. According to the dominant wind direction, generally NW–SE in the northwest Chinese Loess Plateau, a transect was projected to observe spatial changes in sedimentological characteristics of aeolian deposits during the Last Glacial Period. The transect consists of 12 loess sections, starting at Shapotou in the transitional region between the Loess Plateau and the Tengger Desert and ending at Tianshui, which is located at the north foot of the Western Qinling Mountains in the southernmost part of the Loess Plateau. It shows the properties of temporal and spatial distribution of the Malan loess, with reduced sand content from northwest to southeast. A linear correlation model of sand content and distance was obtained, which was similar to the east of the Chinese Loess Plateau. According to this model, and on the basis of optically stimulated luminescence (OSL) dating from Binggou section, a detailed and quantificational expansion and contraction for the Tengger Desert was established. Copyright © 2006 John Wiley & Sons, Ltd.